Hybrid plastisol/hot melt compositions

C - Chemistry – Metallurgy – 09 – J

Patent

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C09J 123/14 (2006.01) C09J 123/06 (2006.01) C09J 123/08 (2006.01) C09J 123/12 (2006.01) C08L 23/10 (2006.01) C08L 23/12 (2006.01) C08L 51/06 (2006.01) C08L 53/00 (2006.01)

Patent

CA 2493515

A multiple component adhesive composition is comprised of a polymeric reinforcing phase component and an adsorbent phase component, both as heterogeneously dispersed particulates in an adsorbed liquid component. The reinforcing phase component is substantially incompatible with the liquid component, the adsorbent phase component is compatible or substantially more compatible with the liquid component than is the reinforcing phase component, and the reinforcing phase and adsorbent phase components are partially compatible with one another. The composition has the rheological characteristics of a liquid dispersion and is capable of forming a molten blend at elevated temperatures that solidifies into a solid adhesive upon cooling. Hot-melt or other liquid compositions may also include nanoparticles at least partially exfoliated as a result of shear mixing.

L'invention concerne une composition adhésive à composants multiples comprenant une phase polymère de renforcement ainsi qu'une phase adsorbante, ces deux composants se présentant sous forme de particules dispersées de manière hétérogène dans un troisième composant, à savoir un liquide adsorbé. La phase de renforcement est sensiblement incompatible avec le composant liquide, la phase adsorbante est compatible ou sensiblement plus compatible avec le composant liquide que ne l'est la phase de renforcement, et la phase de renforcement ainsi que la phase adsorbante sont partiellement compatibles l'une avec l'autre. La composition selon l'invention présente les caractéristiques rhéologiques d'une dispersion liquide et peut former un mélange fondu à des températures élevées, ce mélange se solidifiant pour devenir un adhésif solide lorsqu'il refroidit. Cette invention se rapporte en outre à des compositions thermofusibles ou à d'autres compositions liquides pouvant contenir des nanoparticules qui sont au moins partiellement exfoliées au cours d'un processus de mélange à cisaillement.

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